3-440: † Hongshanornithidae ? † Songlingornithidae Yanornithiformes is an order of ornithuromorph dinosaurs from the early Cretaceous Period of China . All known specimens come from the Yixian Formation and Jiufotang Formation , dating to the early Aptian age, 124.6 to 120 million years ago. The family Songlingornithidae was first named by Hou in 1997 to contain the type genus, Songlingornis . Clarke et al. (2006)
6-492: The songlingornithids in a clade with the hongshanornithids , a group of smaller, more specialized ornithuromorphs from the same time and place as some of the songlingornithids. Other studies however continued to place the hongshanornithids just outside the yanornithiform clade. [REDACTED] [REDACTED] This theropod -related article is a stub . You can help Misplaced Pages by expanding it . Hongshanornithidae Too Many Requests If you report this error to
9-550: Was first to find a close relationship between Songlingornis and the "yanornithids", which had been previously named to contain the similar species Yanornis and Yixianornis . At least one study has found Hollanda from the Late Cretaceous of Mongolia to be a member of this group. The family Yanornithidae (now Songlingornithidae ) had been placed in its own order containing no other families, named Yanornithiformes, in 2001. Beginning in 2012, multiple studies began to recover
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